Mortar gun and disc therefor



Q i United States Patent I [1l13,537,621

[72] Inventor Walter A. Jesse [56] R fere e Cit d JICIKSDII, North,Unioutown, 44685 I i n 1828 056 10/1931 Lamb 92/250 [2|] Appl. No.751,396 [22] Filed Aug, 1968 2,958,4l5 ll/l96 0 Jesse 222/386 [45]Patented Nov. 3, 1970 FOREIGN PATENT S 1,270,689 7/l96l France .l 92/250Primary Examiner-Stanley H. Tollberg Assistant Examiner-11. S. LaneAttorney Freeman & Taylor [54] MORTAR GUN AND DISC THEREFOR lchimdnnwlng Figs ABSTRACT: An improved resilient disc for use on the[52] U.S.Cl. 222/386, plunger of a mortar gun characterized by having aconcave 92/2 peripheral groove terminating in opposed feathered edges so[51] Int. Cl. B671! 5/42 that sealing and wiping contact with theinterior surface of the Search 2/ barrel of the gun are achieved whenthe plunger is both advanced and retracted.

Patented Nov. 3, 1970 3,537,621

I NVEN TOR. WALTER A. JESSE BY yummy ATTORNEYS While a full and completedescription of the invention has been set forth in accordance with thedictates of the Patent Statutes, it should be understood thatmodifications thereof may be resorted to without departing from thespirit hereof or the scope of the appended claims.

I claim:

1. In combination witha mortar gun the improvement comprising:

A. an elongate cylindrical barrel;

8. an elongate shaft mounted within said barrel for reciprocal movementtherein;

C. a backup plate carried on said shaft; D. a rubbery disc having;

1. opposed flat parallel sides;

2. a substantially solid body with a through axial opening for mountingsaid disc on said shaft with one side thereof abutting said backupplate; and

3. a concave peripheral edge terminating in opposed feathered edges:

E. the relationship. between the internal diameter of said barrel andthe diameter of said disc being such that:

1. said feathered-edges normally contact said barrel and lie in the sameplane as said sides while being slightly deformed out of said plane uponmovement of said shaft; and

2. with said concave edge of said disc being at all times spaced fromsaid barrel;

F. a pressure plate;

1. carried on said shaft;

2. having one face thereof abutted against the remaining face of saiddisc with the peripheral edge thereof being disposed in close proximitywith one of said feathered edges of said disc;

G. means for releasably securing said backup plate, said disc and saidpressure plate in axial alignment on said shaft; and

H. said backup plate having its peripheral edge disposed in closeproximity to the remaining feathered edge of said disc.

